Standing thigh deep in the water of a Pennsylvania limestone stream I was enjoying the cold pressure against my waders. It was a welcome feeling during an otherwise hot summer. The morning had been slow to this point, with little-to-no hatch activity. Yet I had been able to pound up 3 fish with the always productive Elk-hair Caddis as first light had welcomed my presence. It seemed I had scarcely moved but to shift my weight for the past 2 hours as I glanced over the pool.